Ah, that... It's common. In the "Finds" thread someone promoting "hi-end" Famicom and there is plates as kit(maybe). Or just go to your local company, which making adz on the vehicles - they have all sorts of sticky plastic film and cutting plotters. Make your own "plates".
did that once with a NES controller that was seriously messed up. It's aged abit from being used (and chucked around abit). The face plate is real brass from the metal workshop where I work.